The Developer's Utility Belt
Free developer tools, practical calculators and interview preparation resources to help you code faster, learn smarter and prepare for your next opportunity.
Popular Tools
Fast, browser-based developer utilities.
Everything Developers Need
Practical tools and resources for everyday development.
🧩 Developer Tools
JSON, JWT, Base64, UUID, Regex, SQL and API utilities.
🧮 Calculators
Programming, finance, productivity and utility calculators.
💼 Interview Preparation
Angular, React, JavaScript, TypeScript and System Design.
Developer Tools & Resources
DevStacker provides free online developer tools, calculators and interview preparation resources. Every tool runs directly in your browser without installation, sign-up or subscriptions.
Whether you're formatting JSON, decoding JWT tokens, preparing for technical interviews or solving everyday development problems, DevStacker helps you work faster and more efficiently.